On an interesting side note, I've learned that there is a group of people who intentionally rupture their eardrums in order to make diving and hunting at sea easier. Who knew?
http://en.wikipedia.org/wiki/Eardrum
Intentional rupture
The Bajau people of the Pacific intentionally rupture their eardrums at an early age in order to facilitate diving and hunting at sea. Many older Bajau are therefore hard of hearing.[2]